This problem was the first thing I noticed when looking at the show pages, and it really bugs me as well. A massive pet peeve of mine is having a show/movie spoiled by someone or something, and this 'newest first' format is set up to have major spoiler potential (i.e. last episode title/thumbnail giving away major clues or answers, etc).

It would be nice if they would (could?) add an option to user settings to change the default listing order on a show's page (which would be preferred), or at least the option to hide certain things like episode titles AND the thumbnails (similar to being able to toggle spoilers in forums) since, like I said, they are (or have the potential to be) major spoilers.